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Vasopressin immunoreactivity, but not vasoactive intestinal polypeptide, correlates with expression of circadian rhythmicity in the suprachiasmatic nucleus of voles
Vasopressin levels, but not another brain chemical, are linked to daily rhythms in the brain's internal clock of voles
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Abstract
Circadian rhythmic voles exhibit a peak in vasopressin immunoreactive suprachiasmatic nucleus neurons at zeitgeber time 0.
- Daily patterns in neuropeptide levels were observed in rhythmic, weakly rhythmic, and non-rhythmic voles.
- Circadian rhythmic voles showed significant variation in vasoactive intestinal polypeptide and vasopressin neuron numbers.
- Voles with weak or no circadian rhythmicity had similar fluctuations in vasoactive intestinal polypeptide but maintained a continuous high level of vasopressin.
- The suprachiasmatic nucleus in voles does not produce somatostatin or substance P.
- High levels of vasopressin in non-rhythmic voles may indicate impaired release, leading to accumulation in the suprachiasmatic nucleus.
- Vasopressin is associated with the expression of circadian behavior in common voles.
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